| khenaidoo | 59ce9dd | 2019-11-11 13:05:32 -0500 | [diff] [blame] | 1 | // Copyright 2017 The etcd Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package cpuutil |
| 16 | |
| 17 | import ( |
| 18 | "encoding/binary" |
| 19 | "unsafe" |
| 20 | ) |
| 21 | |
| 22 | const intWidth int = int(unsafe.Sizeof(0)) |
| 23 | |
| 24 | var byteOrder binary.ByteOrder |
| 25 | |
| 26 | // ByteOrder returns the byte order for the CPU's native endianness. |
| 27 | func ByteOrder() binary.ByteOrder { return byteOrder } |
| 28 | |
| 29 | func init() { |
| 30 | i := int(0x1) |
| 31 | if v := (*[intWidth]byte)(unsafe.Pointer(&i)); v[0] == 0 { |
| 32 | byteOrder = binary.BigEndian |
| 33 | } else { |
| 34 | byteOrder = binary.LittleEndian |
| 35 | } |
| 36 | } |